/**
 * Copyright (c) 2006, Regents of the University of California
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * Neither the name of the University of California, Los Angeles nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Created Aug 24, 2006
 */
package cck.stat;

/**
 * The <code>StatUtil</code> class implements a number of statistical and numerical
 * utility functions that simplify computations of averages, percentages, median, etc.
 *
 * @author Ben L. Titzer
 */
public class StatUtil {

    public static double percent(long n, long d) {
        return 100.0 * n / d;
    }

    public static double percent(double n, double d) {
        return 100.0 * n / d;
    }

    public static long sum(Sequence q) {
        long s = 0;
        Sequence.Iterator i = q.iterator(0);
        while ( i.hasNext() ) s += i.next();
        return s;
    }

    public static long sum(long[] a) {
        long s = 0;
        for ( int cntr = 0; cntr < a.length; cntr++ ) s += a[cntr];
        return s;
    }

    public static long sum(int[] a) {
        long s = 0;
        for ( int cntr = 0; cntr < a.length; cntr++ ) s += a[cntr];
        return s;
    }

    public static double average(long[] a) {
        return sum(a) / (double)a.length;
    }

    public static double average(int[] a) {
        return sum(a) / (double)a.length;
    }
}
